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    <title>webgl 第一课</title>
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    <ul>
        <li><a href="./example/Draw_blue_rectangle.html">01、Draw blue rectangle</a></li>
        <li><a href="./example/Clear_canvas.html">02、 Clear canvas</a></li>
        <li><a href="./example/Draw_point.html">03、 Draw a point</a></li>
        <li><a href="./example/Draw_point_attribute.html">04、 Draw a point attribute</a></li>
        <li><a href="./example/Draw_point_click.html">05、 Draw a point click</a></li>
        <li><a href="./example/change_point_color.html">06、  change point color</a></li>

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